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Coherent acoustic phonons in a coupled hexagonal boron nitride-graphite heterostructure

dc.date.accessioned2024-03-26T10:22:43Z
dc.date.available2024-03-26T10:22:43Z
dc.date.issued2024-02-14
dc.identifierdoi:10.17170/kobra-202403269871
dc.identifier.urihttp://hdl.handle.net/123456789/15607
dc.description.sponsorshipGefördert durch den Publikationsfonds der Universität Kassel
dc.language.isoeng
dc.rightsNamensnennung 4.0 International*
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/*
dc.subjectPhononseng
dc.subjectSemiconductorseng
dc.subjectPicosecond ultrasonicseng
dc.subjectHeterostructureseng
dc.subjectHeat transfereng
dc.subjectOptical propertieseng
dc.subjectThin filmseng
dc.subjectCarbon based materialseng
dc.subjectUltrafast electron diffractioneng
dc.subject.ddc530
dc.titleCoherent acoustic phonons in a coupled hexagonal boron nitride-graphite heterostructureeng
dc.typeAufsatz
dcterms.abstractFemtosecond optically excited coherent acoustic phonon modes (CAPs) are investigated in a free-standing van der Waals heterostructure composed of a 20-nm transparent hexagonal boron nitride (hBN) and a 42-nm opaque graphite layer. Employing ultrafast electron diffraction, which allows for the independent evaluation of strain dynamics in the constituent material layers, three different CAP modes are identified within the bilayer stack after the optical excitation of the graphite layer. An analytical model is used to discuss the creation of individual CAP modes. Furthermore, their excitation mechanisms in the heterostructure are inferred from the relative phases of these modes by comparison with a numerical linear-chain model. The results support an ultrafast heat transfer mechanism from graphite to the hBN lattice system, which is important to consider when using this material combination in devices.eng
dcterms.accessRightsopen access
dcterms.creatorUngeheuer, Arne
dcterms.creatorBach, Nora
dcterms.creatorMir, Mashood Tariq
dcterms.creatorHassanien, Ahmed Shehata
dcterms.creatorNöding, Lukas
dcterms.creatorBaumert, Thomas
dcterms.creatorSchäfer, Sascha
dcterms.creatorSenftleben, Arne
dcterms.extent10 Seiten
dc.relation.doidoi:10.1063/4.0000228
dc.subject.swdPhononger
dc.subject.swdHalbleiterger
dc.subject.swdOptische Eigenschaftger
dc.subject.swdElektronenbeugungger
dc.subject.swdWärmeübertragungger
dc.subject.swdHeterostrukturger
dc.type.versionpublishedVersion
dcterms.source.identifiereissn:2329-7778
dcterms.source.issueIssue 1
dcterms.source.journalStructural Dynamicseng
dcterms.source.volumeVolume 11
kup.iskupfalse
dcterms.source.articlenumber014501


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